HP 3336A - Page 101

Performance Tests Model 3336A/B/C
DC VOLTMETER
IMPEDENCE
MATCHING PADS
(AS REQUIRED)
OV, 73 OHM
THERMAL
CONVERTER
IMPEDANCE MATCHINS PADS
150 TO 75 GHM
o_o
699 TO 75 OHM
o_o
R1
BALANCED 754
BALANCED 750 BALANCED 750
IMPEDANCE UNBALANCED IMPEDANCE UNBALANCED IMPEDANCE UNBALANCED
R1 Re
r
:
Bo
Figure 4-3. Amplitude Flatness Equipment Set Up.
124 AND 135 TO 75 OHM
c. Allow time for the thermal converter to settle before taking any measurements. The
accuracy of this test is enhanced if the thermal converter is protected from drafts and other
sources of temperature change. Measure and record the thermal converter’s output with the
3336 programmed at 10 kHz.
Use extreme caution when making the following measurements
at the 75 ohm output. The converter voltage will approach
maximum, and the converter will be destroyed if care is not
exercised.
d.
Measure
the
thermal
converter
voltage
for
each
output
at
the
frequencies
listed
above.
At
each
frequency
setting,
adjust
the
amplitude
of
the
3336
in
.01
dBm
steps
until
the
con-
verter
voltage
is
equal
to
the
reference
voltage
recorded
at
10
kHz.
When
the
converter
level
matches
the
reference
level,
record
the
amplitude
setting
of
the 3336.
Do
not
adjust
the
amplitude
of
the
3336
in
increments
larger than
.01
dBm.
@
4-16